KNOWITALL: Thursday’s Top 7 Stories at NBC News

Good morning. Here are some of the headlines we're following this morning:

1. In Tapping Fiorina Early, Cruz Echoes Reagan

Ted Cruz's decision to name Carly Fiorina as his running mate on Wednesday is certainly unconventional, but not unprecedented — it echoes Ronald Reagan's gambit heading into the 1976 convention, a history that offers cautionary notes for Cruz. Read more in POLITICS.

2. Trump Questions Cruz Picking a Vice President

3. Airstrike on Syrian Hospital Kills 14 Doctors and Patients

At least 14 doctors and patients were killed after a direct airstrike destroyed a hospital in the Syrian city of Aleppo. Doctors Without Borders said at least three doctors were among the dead — including one of the facility's last remaining pediatricians. Read more in NEWS.

We condemn the destruction of the Al Quds hospital in #Aleppo, depriving people of essential healthcare. Hospitals are #notatarget, #Syria

5. Local Investigators Ask for DEA's Help in Prince's Death

Officials say prescription painkillers were found in the music superstar's possession when he died and in his house near Minneapolis, though officials have yet to say what role, if any, those medications may have played in his death. Read more in POP CULTURE.

6. Footprint Near Shore Leads K-9s to Toddler's Body

The body of 2-year-old Clayton Foskey, who wandered away from his Florida home, has been found, officials said early Thursday. About four hours after Foskey was reported missing Wednesday night, a K-9 team picked up a small footprint near water not far from the boy's home. Read more in NEWS.